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Main article: Boo

Boos are ghosts that haunt abandoned houses and dark forests. On some occasions they will actually inhabit a building, while many Boos live in Forever Forest and Gusty Gulch. Many Boos are afraid of the living, and hide when looked at. Although many pledge allegiance to Bowser, others are ruled by Lady Bow and King Boo (who is an ally of Bowser).